EP0279980A1 - Hochspannungs-Porzellan-Isolatoren - Google Patents
Hochspannungs-Porzellan-Isolatoren Download PDFInfo
- Publication number
- EP0279980A1 EP0279980A1 EP87309510A EP87309510A EP0279980A1 EP 0279980 A1 EP0279980 A1 EP 0279980A1 EP 87309510 A EP87309510 A EP 87309510A EP 87309510 A EP87309510 A EP 87309510A EP 0279980 A1 EP0279980 A1 EP 0279980A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glaze
- porcelain
- insulators
- insulator
- high voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/02—Frit compositions, i.e. in a powdered or comminuted form
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/86—Glazes; Cold glazes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/02—Suspension insulators; Strain insulators
- H01B17/06—Fastening of insulator to support, to conductor, or to adjoining insulator
- H01B17/08—Fastening of insulator to support, to conductor, or to adjoining insulator by cap-and-bolt
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
- H01B3/087—Chemical composition of glass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
- H01B3/088—Shaping of glass or deposition of glass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
Definitions
- the present invention relates to high voltage porcelain insulators having excellent steep wave front characteristic.
- an insulating portion of an insulator is constituted by a porcelain, a glaze and a sanded portion.
- Japanese patent publication Nos. 49-21,865 and 51-4,275 disclose the insulators in which the coefficient of thermal expansion of the glaze is specified. However, they are all to improve the mechanical strength of the insulators.
- the high voltage porcelain insulators according to the present invention have a glaze applied to at least a head portion of the porcelain insulator which head portion is covered with a metal fitting and cement, said glaze comprising, as expressed by weight, from 64.0 to 68.0% of SiO2, from 17.5 to 19.0% of Al2O3, from 5.0 to 6.5% of MgO, not more than 3% of CaO, from 2.0 to 2.8% of K2O+Na2O in a total amount, and from 3.0 to 9.0%, when calculated as MnO, of a compound which is converted into MnO or MnO2 after being fired in a temperature range suitable for firing the porcelain.
- the microstructure of a glaze applied onto the surface of at least the porcelain head portion of the insulator can be improved by incorporating, into basic chemical components of SiO2, Al2O3, MgO, CaO and K2O+Na2O, 3.0 to 9.0% by weight, when calculated as MnO, of a compound which is converted to MnO or MnO2 in a state of an oxide when being fired at a temperature range suitable for firing porcelain.
- the present invention can afford the high voltage porcelain insulators of which head portions may be miniaturized.
- the reason why the number of pores having a diameter of not less than 5 ⁇ m in the glaze is preferably not more than 100/mm2 is that the microstructure in which the pores to deteriorate the steep wave front characteristic are reduced can be obtained.
- the reason why the coefficient of thermal expansion of the glaze is preferably maintained lower than that of the porcelain is that as formerly known, compression force can be obtained due to the compression glaze to increase the mechanical strength of the insulators.
- the difference in the coefficient of thermal expansion is not less than 1.0 ⁇ 10 ⁇ 6/°C because such an enhancing effect is conspicuous.
- the steep wave front characteristic is an index for representing the insulating performance of the insulator head portion in the case where the insulator in a power transmission line is hitted by lightning.
- phenomena ordinarily occurring when the insulator is hitted by lightning there are external flashover passing along the surface of a shed portion of the insulator and a head-penetrating flashover passing through the head portion of the insulator.
- the external flashover occurs.
- the insulator is broken due to the head-penetrating flashover. Thus, such must not occur since serious damages such as line breakage in the power transmission lines takes place.
- Fig. 1 shows the relation among the steepness, the head-penetrating flashover characteristic and the external flashover characteristic by using a voltage-applying time period and an applied voltage as parameters. This relation is influenced by the shape of the insulator.
- the magnitudes of the steepness of A, B and C in Fig. 1 are in the order of A ⁇ B ⁇ C.
- the steepness for the head-penetrating breakage becomes larger, the insulator has more excellent steep wave front characteristic.
- a glaze of Table 1 falling inside or outside the compounding scope of the present invention was applied to each of the outer and inner sides of the head portion of each of the insulator bodies to form glaze layers 1 and 2, which was fired.
- a head cap 3 and a pin 4 both made of a metal were fitted to the insulator body via a cement 5, thereby obtaining insulators for evaluating their characteristics.
- the steep wave front characteristic was evaluated.
- a positive voltage was applied to a pin side at ten times under a constant steepness while the head cap 3 and the pin 4 of each of the insulators were employed as electrodes.
- the polarity was changed, that is, a negative voltage was applied to the pin side of each of the insulators at 10 times. Further, similar tests were carried out for other lots while the steepness was varied.
- Results were shown in Table 1 in which " ⁇ ” denotes no head-penetrating breakage, “ ⁇ ” denotes a case where only one of ten insulators was broken due to head penetrating flashover, and “ ⁇ ” denotes a case where two or more of the ten insulators were broken due to the head penetrating flashover.
- Pores contained in the glaze layers 1 and 2 observed by means of an image analyzer with respect to a sample which was obtained by cutting a portion of the glaze at the head portion of the insulator having actually undergone the steep wave front characteristic test and polishing it in a direction orthogonal to the surface of the glaze layers 1 and 2.
- the number of pores was counted until it reached about 1,000 with respect to each of the samples for enabling sufficient measurement of the static distribution. Results are also shown in Table 1. Further, the coefficient of thermal expansion of each of the glazes was measured and shown in Table 1.
- the number of the pores in the glaze used in the insulators falling inside the scope of the present invention is not more than 100/mm2, and the coefficient of thermal expansion of the glaze is smaller than that of the porcelain, that is, smaller by 1.0 ⁇ 10 ⁇ 6/°C or more. It is seen that the above ranges of the number of the pores and the coefficient of the thermal expansion are preferred.
- the present invention will not be limited to the above-mentioned examples only, but various modifications and changes could be made.
- the glaze having the specified composition was applied to the head portion only.
- the present invention will not be limited to this style, and the effects aimed at by the present invention could be obtained by applying the glaze to at least the head portion.
- the high voltage porcelain insulators of the present invention contradictory performances of the steep wave front characteristic and the high strength which give excellent performances as the insulators can both be attained by applying the glaze having the specified chemical composition to at least the head portion of the porcelain. Therefore, the head portions of the high voltage porcelain insulators can be minimized, thereby enabling small size and light weight of the insulators.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Insulators (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62040457A JPS63211525A (ja) | 1987-02-25 | 1987-02-25 | 高電圧用磁器碍子 |
JP40457/87 | 1987-02-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0279980A1 true EP0279980A1 (de) | 1988-08-31 |
EP0279980B1 EP0279980B1 (de) | 1992-01-08 |
Family
ID=12581172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87309510A Expired EP0279980B1 (de) | 1987-02-25 | 1987-10-28 | Hochspannungs-Porzellan-Isolatoren |
Country Status (7)
Country | Link |
---|---|
US (1) | US4782199A (de) |
EP (1) | EP0279980B1 (de) |
JP (1) | JPS63211525A (de) |
BR (1) | BR8705822A (de) |
CA (1) | CA1283180C (de) |
DE (1) | DE3775920D1 (de) |
IN (1) | IN165690B (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0388133A2 (de) * | 1989-03-17 | 1990-09-19 | Ngk Insulators, Ltd. | Hängeisolator |
EP0882690A1 (de) * | 1997-06-02 | 1998-12-09 | Ngk Insulators, Ltd. | Keramischer Körper mit leitfähiger Glasur |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0679455B2 (ja) * | 1990-09-29 | 1994-10-05 | 日本碍子株式会社 | 高電圧用磁器碍子の製造法 |
CN1089477C (zh) * | 1994-03-28 | 2002-08-21 | 日本碍子株式会社 | 具有导电表面涂层以防止电晕放电的绝缘子 |
US5981878A (en) * | 1996-04-22 | 1999-11-09 | Hubbell Incorporated | Polymer insulators with metal caps |
JP2002150862A (ja) * | 2000-08-28 | 2002-05-24 | Ngk Insulators Ltd | 懸垂がいし |
JP2006016227A (ja) * | 2004-06-30 | 2006-01-19 | Koyo Denki Kogyo Kk | 多孔性焼結体の製造方法 |
CN102241506A (zh) * | 2010-05-13 | 2011-11-16 | 苏州爱建电瓷有限公司 | 一种绝缘子瓷体用陶瓷的配方及绝缘子瓷体的制备方法 |
WO2012131180A1 (fr) * | 2011-03-31 | 2012-10-04 | Sediver Societe Europeenne D'isolateurs En Verre Et Composite | Élément diélectrique pour isolateur haute tension à haute résistance mécanique en traction |
US8987158B2 (en) * | 2012-11-16 | 2015-03-24 | Victor Insulators, Inc. | Friable-resistant dielectric porcelain |
CN112441824B (zh) * | 2020-12-11 | 2021-06-29 | 湖南兴诚电瓷电器有限公司 | 一种耐低温高压输电用瓷绝缘子及其制备方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1008178A1 (ru) * | 1981-11-04 | 1983-03-30 | Всесоюзный Научно-Исследовательский И Проектно-Технологический Институт Электрокерамики | Глазурь |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2157100A (en) * | 1938-12-20 | 1939-05-09 | Locke Insulator Corp | Glazed ceramic insulator and the like |
US2250044A (en) * | 1939-04-11 | 1941-07-22 | Locke Insulator Corp | Insulator |
US2287976A (en) * | 1940-06-27 | 1942-06-30 | Locke Insulator Corp | Insulator |
US2389386A (en) * | 1942-06-17 | 1945-11-20 | Westinghouse Electric Corp | Glazed ceramic |
US3024303A (en) * | 1960-03-09 | 1962-03-06 | Ohio Brass Co | Glazed insulator which comprises a ceramic body and a primary coat under the glaze which has a lower coefficient of thermal expansion than the ceramic body |
US3097101A (en) * | 1960-04-22 | 1963-07-09 | Gen Electric | Ceramic product and method of making the same |
JPS4921865A (de) * | 1972-05-30 | 1974-02-26 | ||
FR2272816A1 (en) * | 1974-05-28 | 1975-12-26 | Airfix Ind Ltd | Forming joints between margins of flexible blanks - by gripping between surfaces and injecting material along preferred path |
-
1987
- 1987-02-25 JP JP62040457A patent/JPS63211525A/ja active Granted
- 1987-10-26 US US07/112,274 patent/US4782199A/en not_active Expired - Lifetime
- 1987-10-26 IN IN836/CAL/87A patent/IN165690B/en unknown
- 1987-10-28 EP EP87309510A patent/EP0279980B1/de not_active Expired
- 1987-10-28 CA CA000550426A patent/CA1283180C/en not_active Expired - Lifetime
- 1987-10-28 DE DE8787309510T patent/DE3775920D1/de not_active Expired - Lifetime
- 1987-10-30 BR BR8705822A patent/BR8705822A/pt not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1008178A1 (ru) * | 1981-11-04 | 1983-03-30 | Всесоюзный Научно-Исследовательский И Проектно-Технологический Институт Электрокерамики | Глазурь |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0388133A2 (de) * | 1989-03-17 | 1990-09-19 | Ngk Insulators, Ltd. | Hängeisolator |
EP0388133A3 (de) * | 1989-03-17 | 1991-07-31 | Ngk Insulators, Ltd. | Hängeisolator |
EP0882690A1 (de) * | 1997-06-02 | 1998-12-09 | Ngk Insulators, Ltd. | Keramischer Körper mit leitfähiger Glasur |
Also Published As
Publication number | Publication date |
---|---|
JPS63211525A (ja) | 1988-09-02 |
DE3775920D1 (de) | 1992-02-20 |
IN165690B (de) | 1989-12-09 |
US4782199A (en) | 1988-11-01 |
JPH0378726B2 (de) | 1991-12-16 |
CA1283180C (en) | 1991-04-16 |
EP0279980B1 (de) | 1992-01-08 |
BR8705822A (pt) | 1988-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0279980B1 (de) | Hochspannungs-Porzellan-Isolatoren | |
EP0788204B1 (de) | Keramikisolator, sein Herstellung und Zündkerze mit solchem Isolator | |
EP0954074A3 (de) | Zündkerze und Herstellungsverfahren der Zündkerze | |
KR20090101253A (ko) | 스파크 플러그 인슐레이터로서 사용하기 위한 향상된 고온 전기 특성을 가진 세라믹 | |
CA1213640A (en) | Lightning arrester insulator | |
JPS63190753A (ja) | アルミナ磁器および点火プラグ | |
EP1039485B1 (de) | Porzellanisolator und Verfahren zu seiner Herstellung | |
US10038309B2 (en) | Ceramic spark plug insulator, spark plug, and use of a glaze on a spark plug insulator | |
DE10229338B4 (de) | Zündkerze und Zündkerzenisolator | |
US3982048A (en) | Method of making an insulator with a non-linear resistivity coating of glass bonded silicon carbide | |
EP3148022B1 (de) | Zündkerze | |
CA1196700A (en) | High voltage porcelain insulators | |
JP4094162B2 (ja) | 高電圧用磁器がいし | |
US4796149A (en) | Lightning arrestor insulator | |
CA2212255C (en) | Insulator with cement compound and method for its production | |
DE3229271A1 (de) | Temperaturschockbestaendige keramische auskleidungen | |
WO1998011030A1 (de) | Glasartige zusammensetzung | |
WO1979000737A1 (en) | Utilization of a glass-ceramic material as electrical insulator | |
JPH0158682B2 (de) | ||
SU1368300A1 (ru) | Кермет | |
JPH0260631B2 (de) | ||
EP0869924A1 (de) | Glasartige zusammensetzung | |
SU1494081A1 (ru) | Малогабаритна чейка комплектно-распределительного устройства | |
JPS60189107A (ja) | 磁器誘電体組成物 | |
JPS6264010A (ja) | 電気絶縁碍子 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
17P | Request for examination filed |
Effective date: 19881017 |
|
17Q | First examination report despatched |
Effective date: 19900315 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REF | Corresponds to: |
Ref document number: 3775920 Country of ref document: DE Date of ref document: 19920220 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20060915 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20061031 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20071027 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20061003 Year of fee payment: 20 |